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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 %73 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921-0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton / 980129-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9801 H79 -01 Reported Feb 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO20698802002A GCO20698802002A GCO20698802002A GCO20698802002A GCO20698802002A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb 0 Newcomb D Newcomb <br /> MS/MSD # 8020237 8020237 8020237 8020237 8020237 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Analyzed Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20 pg/L 20 Ng/L 20pg/L 60 Pg/L 300 jig/L <br /> Result 21 21 21 65 360 <br /> MS % Recovery 105 105 105 108 120 <br /> Dup Result 21 21 22 64 310 <br /> MSD % Recov 105 105 110 107 103 <br /> RPD 00 00 47 16 15 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS020698 LCS020698 LCS020698 LCS020598 LCS020696 <br /> Prepared Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Analyzed Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20yg/L 20pg/L 20pg/L 60ug/L 300 ug/L <br /> LCS Result 21 21 22 66 300 <br /> LCS % Recov 105 105 110 110 100 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> 7egnner <br /> /N./�A�/YITT]CAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 1 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> nager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9801H79 BLA <1> <br />